Tag: TKGI to OpenShift Series
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Decommissioning TKGI and Ops Manager, and What Comes Next (TKGI to OpenShift Series, Part 26)
A ten step teardown runbook for retiring a TKGI estate after the OpenShift cutover, covering cluster deletion, the TKGI tile, Ops Manager, BOSH, and the NSX-T and vSphere objects that survive every documented step.
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OpenShift Observability, Backup and Disaster Recovery (TKGI to OpenShift Series, Part 25)
A runbook for giving a freshly migrated OpenShift cluster real metric retention, restorable etcd snapshots and scheduled OADP application backups. Three recovery domains, three tools, and measured restore times for each.
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Day-2 on OpenShift, Operators, Upgrades and Scaling vs BOSH (TKGI to OpenShift Series, Part 24)
Production traffic is on OpenShift, so now you own a platform that updates itself. Here is the runbook we use for a minor update, Operator channels, MachineSet scaling and health checks, with the timings and the two failures that cost us a window.
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Production Cutover, Traffic Shift, Validation and Rollback (TKGI to OpenShift Series, Part 23)
Moving live production traffic off TKGI onto OpenShift without a visible outage, using weighted Routes as the only lever on the night. Includes a five step traffic ladder, real preflight commands, and a cutover I reversed at 03:40.
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Pilot Migration, One Non-Prod Cluster End to End (TKGI to OpenShift Series, Part 22)
A pilot that passes proves nothing unless the app team runs it. Here is how I moved one non production TKGI cluster onto OpenShift 4 end to end, with the exit criteria scorecard, the real timings and the rollback.
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Secrets, Config and CI/CD Pipeline Migration to OpenShift (TKGI to OpenShift Series, Part 21)
Credentials and build pipelines are the last things to follow your workloads off TKGI, and the obvious move, restoring secrets from a Velero backup, is the wrong one. Here is how to rotate at the platform boundary, wire External Secrets, and rebuild Jenkins jobs as OpenShift Pipelines.
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Ingress to Routes, Load Balancing and DNS Cutover (TKGI to OpenShift Series, Part 20)
Moving wave1-web traffic off NSX-T and onto OpenShift Routes, with a weighted load balancer cutover, a TTL schedule that survives stale resolvers, and the 504 that only appears after you switch. Part 20 of the TKGI to OpenShift Series.
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Migrating a Stateful Application with Persistent Volumes (TKGI to OpenShift Series, Part 19)
Moving a PostgreSQL StatefulSet and 61 GiB of live data from TKGI to OpenShift with Velero and OADP, including the storage class mapping, the pre-backup hook and the admission failure that costs most teams an afternoon.
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Migrating a Stateless Application End to End (TKGI to OpenShift Series, Part 18)
Moving your first stateless namespace off TKGI is less about Velero than about what OpenShift admission does to the pods when they land. Here is the whole loop, including a restore that reported success while nothing started.
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Migration Toolchain, Velero on TKGI and OADP on OpenShift (TKGI to OpenShift Series, Part 17)
Velero on the TKGI side writes to object storage and OADP restores on OpenShift. Here is the install, the version pin that keeps both ends compatible, and the read only backup location that stops OpenShift deleting your source backups.
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Network Policy and Microsegmentation, NSX-T DFW to OVN-Kubernetes (TKGI to OpenShift Series, Part 16)
Your NSX-T distributed firewall holds far more rules than kubectl will ever show you. Here is the DFW to OVN-Kubernetes mapping, a namespace baseline that does not break DNS, and where AdminNetworkPolicy actually belongs.
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OpenShift OAuth, LDAP Group Sync and Registry Setup (TKGI to OpenShift Series, Part 15)
Login proves identity, and group membership does not arrive with it. Here is how to wire OpenShift OAuth to the directory behind TKGI, sync groups on a schedule, bind roles, and decide whether the internal image registry or Harbor serves your migration waves.
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About the Author
Dr Pranay Jha
Dr. Pranay Jha is a Cloud and AI Consultant with 18+ years of experience in hybrid cloud, virtualization, and enterprise infrastructure transformation. He specializes in VMware technologies, multi-cloud strategy, and Generative AI solutions. He holds a PhD in Computer Applications with research focused on Cloud and AI, has published multiple research papers, and has been a VMware vExpert since 2016 and a VMUG Community Leader.
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